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Beyonce spotted leaving Kayne West's birthday party at Miss Lily's on June 8, 2013 in New York City -- …

If Beyonce is pregnant, she sure is hiding it remarkably well!

The 31-year-old superstar -- who has been the subject of pregnancy rumors for weeks -- showed off her abs in a midriff-baring ensemble at Kanye West's birthday party in New York City on Saturday night.

Beyonce wore a black and white striped, body-hugging skirt with a matching, long-sleeved crop top - revealing her petite and very toned, muscular stomach.